In this thesis we report on the characteristics of nanocomposite systems that are prepared by mixing superconducting and ferromagnetic materials. The influence of magnetic material on traditional superconductor is discussed through magnetic susceptibility,magnetization, and electron transport measurement. The five set of samples consist of same size of nickel nanoparticles with two different sizes of indium nanoparticles.Tc is reduced by interparticle proximity effect from neighboring magnetic particles. Furthermore, the electron transport reveals unusual two component behavior. Free electron model and Ginzburg-Landau theory are used to calculate GL parameter κ. Then according to the criterion of typeⅡ superconductor, the value of κ is greater than 1. From both the calculated κ value and two component behaviors, this system is classified to the typeⅡ-like superconductor. The diamagnetic signals of superconductivity in large particles are stronger than small ones.Interestingly, the small and large nanoparticles have shown entirely different physical properties.The small particle size sample shows the coexistence ofsuperconductivity and hopping conduction at low temperature. Spin dependent magnetoresistance (MR) and negative MR at high applied magnetic field regime are observed at normal state and superconducting state respectively.In50-Ni50 is the sample in large particle size series. It shows diamagnetic superconducting signals under different applied magnetic field at below Tc. At temperature below 2.5K, magnetic susceptibility and magnetization increase with decreasing temperature which signals the existence of spin polarized moment. We attribute these behaviors to thecoexistence of superconductivity and spin polarized moment. Moreover,the electron transport data exhibits superconductivity dependent double reentrant behavior and unconcerned with spin polarized magnetic moment.